103 research outputs found
Darboux Transformation of the Green Function for the Dirac Equation with the Generalized Potential
We consider the Darboux transformation of the Green functions of the regular
boundary problem of the one-dimensional stationary Dirac equation. We obtained
the Green functions of the transformed Dirac equation with the initial regular
boundary conditions. We also construct the formula for the unabridged trace of
the difference of the transformed and the initial Green functions of the
regular boundary problem of the one-dimensional stationary Dirac equation. We
illustrate our findings by the consideration of the Darboux transformation for
the Green function of the free particle Dirac equation on an interval.Comment: 14 pages,zip. file: Latex, 1 figure. Typos corrected, the figure
replace
Elasticity modules and acoustic properties of metal ceramics on the basis of tungsten monocarbide
The results of measurements of acoustic wave speeds and elasticity modules of metal ceramic alloys on the basis of tungsten monocarbide in temperature range of 100...295 K as well as amplitude dependences of internal friction at temperatures 140...295 K and after ?-irradiation (60Со, 1,25 MeV, 5.103 and 105 Gy) have been given. It was shown that elasticity modules of alloys decrease monotonously at increase of cobalt concentration. Radiation influence stimulates the processes complicating movement of grain boundary dislocations in alloys. Representation of these alloys in the form of isotropic mixes of anisotropic phases describes qualitatively correctly the dependence of elasticity modules on structure. The resulted experimental and calculated values of elasticity modules may be used for estimation of elastic and strength properties of these alloy
Historical conditions of human capital’s formation in the higher education’s non-state sector abroad
Private education in most countries is considered as an important part of the national education system. Having a long history private education demonstrates high quality and standards of education. Historical conditions of human capital’s formation in the non-state sector of higher education in foreign countries (China, the UK, the USA, and others) are analyzed. Features of human capital’s formation in the private sector of education in different countries are characterized
Connection between the Green functions of the supersymmetric pair of Dirac Hamiltonians
The Sukumar theorem about the connection between the Green functions of the
supersymmetric pair of the Schr\"odinger Hamiltonians is generalized to the
case of the supersymmetric pair of the Dirac Hamiltonians.Comment: 12 pages,Latex, no figure
MSSM-inspired multifield inflation
Despite the fact that experimentally with a high degree of statistical
significance only a single Standard Model--like Higgs boson is discovered at
the LHC, extended Higgs sectors with multiple scalar fields not excluded by
combined fits of the data are more preferable theoretically for internally
consistent realistic models of particle physics. We analyze the inflationary
scenarios which could be induced by the two-Higgs doublet potential of the
Minimal Supersymmetric Standard Model (MSSM) where five scalar fields have
nonminimal couplings to gravity. Observables following from such MSSM-inspired
multifield inflation are calculated and a number of consistent inflationary
scenarios are constructed. Cosmological evolution with different initial
conditions for the multifield system leads to consequences fully compatible
with observational data on the spectral index and the tensor-to-scalar ratio.
It is demonstrated that the strong coupling approximation is precise enough to
describe such inflationary scenarios.Comment: 27 pages, 4 figures, 5 tables. Version to appear in JHEP. Additions
made to the text of the Introduction dealing with the issues of conformity of
this multifield model and models of N=1 supergravity (pages 2-3). Added new
inflationary scenarios, which are an artifact of such analysis (pages 11-12,
Tables 1-4). Additional comments on page 9 and page 13. New references adde
Coherent Schwinger Interaction from Darboux Transformation
The exactly solvable scalar-tensor potential of the four-component Dirac
equation has been obtained by the Darboux transformation method. The
constructed potential has been interpreted in terms of nucleon-nucleon and
Schwinger interactions of neutral particles with lattice sites during their
channeling Hamiltonians of a Schwinger type is obtained by means of the Darboux
transformation chain. The analitic structure of the Lyapunov function of
periodic continuation for each of the Hamiltonians of the family is considered.Comment: 12 pages, Latex, six figures; six sections, one figure adde
On the superstring-inspired quantum correction to the Starobinsky model of inflation
Superstring/M-theory is the theory of quantum gravity that can provide the
UV-completion to viable inflation models. We modify the Starobinsky inflation
model by adding the Bel-Robinson tensor squared term
proposed as the leading quantum correction inspired by superstring theory. The
model under consideration has
two parameters: the inflaton mass and the string-inspired positive
parameter . We derive the equations of motion in the
Friedmann-Lemaitre-Robertson-Walker universe and investigate its solutions. We
find the physical bounds on the value of the parameter by demanding the
absence of ghosts and consistency of the derived inflationary observables with
the measurements of the cosmic microwave background radiation.Comment: 22 pages, 5 figures, LaTe
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